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https://issues.apache.org/jira/browse/SOLR-14985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226782#comment-17226782
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Shalin Shekhar Mangar commented on SOLR-14985:
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Linking to SOLR-14966 and SOLR-14967
> Slow indexing and search performance when using HttpClusterStateProvider
> ------------------------------------------------------------------------
>
> Key: SOLR-14985
> URL: https://issues.apache.org/jira/browse/SOLR-14985
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Reporter: Shalin Shekhar Mangar
> Priority: Major
>
> HttpClusterStateProvider fetches and caches Aliases and Live Nodes for 5
> seconds.
> The BaseSolrCloudClient caches DocCollection for 60 seconds but only if the
> DocCollection is not lazy and all collections returned by
> HttpClusterStateProvider are not lazy which means they are never cached.
> The BaseSolrCloudClient has a method for resolving aliases which fetches
> DocCollection for each input collection. This is an HTTP call with no caching
> when using HttpClusterStateProvider. This resolveAliases method is called
> twice for each update.
> So overall, at least 3 HTTP calls are made to fetch cluster state for each
> update request when using HttpClusterStateProvider. There may be more if
> aliases are involved or if more than one collection is specified in the
> request. Similar problems exist on the query path as well.
> Due to these reasons, using HttpClusterStateProvider causes horrible
> latencies and throughput for update requests.
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